Norway Floating Tunnel Project in Hindi
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The concept of submerged floating tunnels is based on well-known technology applied to floating bridges and offshore structures, but the construction is mostly similar to that of immersed tunnels: After the tube is prefabricated in sections in a dry dock and the sections are moved to the site, one way is to first seal the sections; sink them into place, while sealed; and, when the sections are fixed to each other, break the seals. Another possibility is to leave the sections unsealed, and after welding them together at the site, pump the water out.
The ballast is calculated so that the structure has approximate hydrostatic equilibrium (that is, the tunnel is roughly the same overall density as water), whereas immersed tube tunnels are ballasted to achieve negative buoyancy so they tend to remain on the sea bed. This, of course, means that a submerged floating tunnel must be anchored to the ground or to the water surface to keep it in place, depending on the buoyancy of the submerged floating tunnel: slightly positive or negative, respectively
Norwegian Public Roads Administration is in the process of creating the world’s first floating highway. The Coastal Highway Route E39 will cut down a 21 hour travel time between the Norwegian cities of Kristiansand in the south and Trondheim in the north by at least half through the elimination of seven different ferry crossings. These crossings will be replaced with bridges, tunnels, and the innovative new Submerged Floating Tube Bridges which give the Coastal road its nickname. But Norway has its work cut out for it, as a project of this size and scale with the use of the floating tunnels has yet to be completed anywhere else in the world-- and attempting the historic roadway project will cost more than $47 billion.
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